Once they get to about 150 accepted, the question for TTC will be MTBF. Thirty cars not delivered, versus thirty on the shop tracks for repair, looks about the same to the ridership.
How far does a streetcar travel in a day? Would it be 300 to 400km on average? I'm guessing 400km would be quite high as rush-only vehicles would bring that down significantly as regular maintenance. Either way, I went with 400km/day average travel below.
A 14,278km mdbf (reported Sept 2018) would put each vehicle in the shop every ~35 days if they typically run 400km/day. If you assume it takes 2 days to fix (and I understand many are redeployed on the same-day) it would mean ~11 in the shop for maintenance at any given time due to failures instead of the expected 4 in the shop for unexpected maintenance for a targetted 35,000km mdbf.
So Bombardier could make TTC whole by providing a maximum of 7 additional vehicles and a stack of replacement parts; it's likely fewer vehicles than that.
Obviously it would be best if they manage to up the reliability and kick in a couple vehicles anyway as an apology.